Time Balanced Accounts and YTD Reports

 Tricky Question:

In Essbase 11.1.2. we want to convert this BSO outline to ASO:

Time Dimension:

Year Total

--Q1 (+)

--Q2 (+)

--Q3 (+)

--Q4 (+)

Year Alternate Rollup

--YTD Q1

----Q1 (+) (Shared Member)

--YTD Q2

----Q1 (+) (Shared Member)

----Q2 (+) (Shared Member)

--YTD Q3

----Q1 (+) (Shared Member)

----Q2 (+) (Shared Member)

----Q3 (+) (Shared Member)

--YTD Q4

----Q1 (+) (Shared Member)

----Q2 (+) (Shared Member)

----Q3 (+) (Shared Member)

----Q4 (+) (Shared Member)

And we have around 6'000 accounts with TB last attributes...

Any ideas how to build such a time dimension in ASO?